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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2017
Share-based Compensation [Abstract] |
Stock-Based Compensation | Stock-Based Compensation A summary of stock-based compensation costs follows (in millions):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Total stock-based compensation costs: |  |  |  |  |  |  |
Restricted stock units | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 0.1 |
Stock options | 0.1 |  |  | 0.1 |  |  | 0.2 |  |  | 0.2 |
Expense included in selling, general and administrative expense | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.2 |  |  | $ | 0.3 |
Total recognized tax benefit | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
As of June 30, 2017, there was $0.6 million of unrecognized compensation cost related to unvested stock-based payments granted, of which $0.5 million relates to stock options and $0.1 million relates to unvested restricted stock units. That cost is expected to be recognized over a weighted-average period of 1.4 years. Stock-based compensation cost is measured at the grant date, based on the fair value of the award, and is recognized on a straight-line basis over the requisite service period. Stock options vest and become exercisable in equal annual installments over a three- or four-year period and expire 10 years from the date of grant. Assumptions used in the Black-Scholes option pricing model to value option grants follow. There were no option grants in the six months ended June 30, 2017.
| Six Months Ended June 30, 2016
Risk-free interest rate | 1.9%
Expected volatility | 75%
Expected option life (years) | 6
Weighted-average grant date fair value | $1.77
Options granted (in thousands) | 15
A total of 25,000 restricted stock units were issued to non-employee, independent members of the Board of Directors on May 31, 2017. The restricted stock units vest over one year, absent a defined event that would accelerate vesting. Settlement of restricted stock units is made in shares of Class A Common Stock only upon the director’s retirement or other end of service. Shares Outstanding

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 + Details
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